Juan has an average math grade of 89 after five math tests. The table shows the grades of his first four math tests. What is Juan's grade on his 54) math test?

Just look at the picture!!

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?